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学ぶ Understanding and Using Font Properties | Section
CSS Core Fundamentals

Understanding and Using Font Properties

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Here are the most common CSS properties used to style fonts:

selector {
  font-family: 'Montserrat' | 'Oswald' | 'Lato' |...; /* any font family */
  font-size: 12px | 0.5em | 0.8rem |...; /* it can be any value in px/em/rem units */
  font-weight: 400 | 500 | 700 | 900 |...; /* value 100 - 900 */
  font-style: normal | italic | oblique; /* only these values available */
}
Note
Note

All examples use the same text to show how these properties change appearance.

font-family

Defines the typeface used to display text. You can set one font or a list of fallback fonts separated by commas.

font-size

Controls the size of text. px: fixed size. em/rem: size relative to the parent or root element.

font-weight

Controls the thickness of text. Numeric values: 100–900. Keywords: normal, bold, lighter.

font-style

Specifies the style of the text: normal, italic, or oblique.

Pseudo-class ::first-letter

::first-letter targets the first letter of an element (typically a paragraph or heading), allowing decorative or stylized effects.

selector::first-letter {
 /* some styles */
}

Let's run the next example to see how it works.

index.html

index.html

styles.css

styles.css

Note
Summary

font-family sets the font and fallbacks.

font-size controls text size in px, em, or rem.

font-weight adjusts thickness using numbers or keywords.

font-style changes the font style.

::first-letter styles the first letter of a text block.

1. Which property determines the thickness of the font?

2. What is the default value for the font-style property in CSS?

question mark

Which property determines the thickness of the font?

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question mark

What is the default value for the font-style property in CSS?

正しい答えを選んでください

すべて明確でしたか?

どのように改善できますか?

フィードバックありがとうございます!

セクション 1.  15

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Understanding and Using Font Properties

Here are the most common CSS properties used to style fonts:

selector {
  font-family: 'Montserrat' | 'Oswald' | 'Lato' |...; /* any font family */
  font-size: 12px | 0.5em | 0.8rem |...; /* it can be any value in px/em/rem units */
  font-weight: 400 | 500 | 700 | 900 |...; /* value 100 - 900 */
  font-style: normal | italic | oblique; /* only these values available */
}
Note
Note

All examples use the same text to show how these properties change appearance.

font-family

Defines the typeface used to display text. You can set one font or a list of fallback fonts separated by commas.

font-size

Controls the size of text. px: fixed size. em/rem: size relative to the parent or root element.

font-weight

Controls the thickness of text. Numeric values: 100–900. Keywords: normal, bold, lighter.

font-style

Specifies the style of the text: normal, italic, or oblique.

Pseudo-class ::first-letter

::first-letter targets the first letter of an element (typically a paragraph or heading), allowing decorative or stylized effects.

selector::first-letter {
 /* some styles */
}

Let's run the next example to see how it works.

index.html

index.html

styles.css

styles.css

Note
Summary

font-family sets the font and fallbacks.

font-size controls text size in px, em, or rem.

font-weight adjusts thickness using numbers or keywords.

font-style changes the font style.

::first-letter styles the first letter of a text block.

すべて明確でしたか?

どのように改善できますか?

フィードバックありがとうございます!

セクション 1.  15
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